/*
 *  ppui/sdl/DisplayDeviceOGL_SDL.cpp
 *
 *  Copyright 2009 Peter Barth, Christopher O'Neill
 *
 *  This file is part of Milkytracker.
 *
 *  Milkytracker is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Milkytracker is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Milkytracker.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/* Using the OpenGL API for drawing/font operations turned out to be very CPU
 * intensive.. This code left here for historic reasons (edit the relevant
 * parts of src/tracker/Makefile.am if you want to play around).
 */

#include "DisplayDeviceOGL_SDL.h"
#include "Graphics.h"

#ifdef __OPENGL__

    #ifdef __APPLE__
        #include <OpenGL/OpenGL.h>
    #endif

PPDisplayDeviceOGL::PPDisplayDeviceOGL (SDL_Surface*& screen,
                                        pp_int32 width,
                                        pp_int32 height,
                                        pp_int32 scaleFactor,
                                        pp_int32 bpp,
                                        bool fullScreen,
                                        Orientations theOrientation /* = ORIENTATION_NORMAL*/,
                                        bool swapRedBlue /* = false*/) :
    PPDisplayDevice(screen, width, height, bpp, scaleFactor, fullScreen, theOrientation)
{
    const SDL_VideoInfo* videoinfo;

    /* Some SDL to get display format */
    videoinfo = SDL_GetVideoInfo();
    if (bpp == -1)
    {
        bpp = videoinfo->vfmt->BitsPerPixel > 16 ? videoinfo->vfmt->BitsPerPixel : 16;
    }

    Uint32 videoFlags = SDL_OPENGL;    /* Enable OpenGL in SDL          */
    videoFlags |= SDL_GL_DOUBLEBUFFER; /* Enable double buffering       */
    videoFlags |= SDL_HWPALETTE;       /* Store the palette in hardware */
    //videoFlags |= SDL_ASYNCBLIT;

    /* This checks to see if surfaces can be stored in memory */
    if (videoinfo->hw_available)
        videoFlags |= videoinfo->hw_available ? SDL_HWSURFACE : SDL_SWSURFACE;

    /* This checks if hardware blits can be done */
    if (videoinfo->blit_hw)
        videoFlags |= SDL_HWACCEL;

    /* Sets up OpenGL double buffering */
    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

    /* Set a video mode */
    theSurface = screen = CreateScreen(realWidth, realHeight,
                                       bpp, videoFlags | (bFullScreen == true ? SDL_FULLSCREEN : 0));
    if (NULL == screen)
    {
        fprintf(stderr, "Could not set video mode: %s\n", SDL_GetError());
        exit(2);
    }

    #if 0
    CGLError err;
    CGLContextObj ctx = CGLGetCurrentContext();

    // Enable the multi-threading
    err = CGLEnable(ctx, kCGLCEMPEngine);

    if (err != kCGLNoError)
    {
        exit(2);
    }
    #endif

    currentGraphics = new PPGraphics_OGL(width, height);
    currentGraphics->lock = true;
}

PPDisplayDeviceOGL::~PPDisplayDeviceOGL ()
{
    // base class is responsible for deleting currentGraphics
}

PPGraphicsAbstract* PPDisplayDeviceOGL::open()
{
    if (!isEnabled())
        return NULL;

    if (currentGraphics->lock)
    {
        if (SDL_LockSurface(theSurface) < 0)
            return NULL;

        currentGraphics->lock = false;

        return currentGraphics;
    }

    return NULL;
}

void PPDisplayDeviceOGL::close()
{
    SDL_UnlockSurface(theSurface);

    currentGraphics->lock = true;
}

void PPDisplayDeviceOGL::update()
{
    if (!isUpdateAllowed() || !isEnabled())
        return;

    if (theSurface->locked)
    {
        return;
    }

    SDL_GL_SwapBuffers();

    //SDL_UpdateRect(theSurface, 0, 0, 0, 0);
}

void PPDisplayDeviceOGL::update(const PPRect& r)
{
    update();

    //PPRect r3 = r;
    //transformInverse(r3);

    //SDL_UpdateRect(theSurface, r3.x1, r3.y1, r3.x2-r3.x1, r3.y2-r3.y1);
}

#endif